@Ivan ***********
you are correct. To renew one year from an O-A you must have the 40,
*******
,000 baht cover only from one of the 12 Thai companies approved by Immigration. I did it here in June. OPD cover for 40,000 baht very expensive. Especially if you are over 75. IMHO it is just a money grabbing exercise arranged between The Immigration Dept and the Thai Insurance Companies involved.